[FIXED] How to replace any brackets for rounded brackets using Regular Expression?

Issue

Here is code:

$string="{1},[2],(3),<4>";
// Replaces closing square, curly, angle brackets with round brackets
$string = preg_replace('/\{\[\</', '(', $string);
$string = preg_replace('/\}\]\>/', ')', $string);

It didn't replace at all in that string... Any better coding than that?

Thanks.

Solution

{[< never occurs in your string. Use a character class or optional grouping.

$string = preg_replace('/[{[<]/', '(', $string);
$string = preg_replace('/[}>\]]/', ')', $string);

Alternative non character class approach:

$string = preg_replace('/(?:\{|<|\[)/', '(', $string);
$string = preg_replace('/(?:\}|>|\])/', ')', $string);

https://3v4l.org/URvcb

Answered By - user3783243

Answer Checked By - Willingham (PHPFixing Volunteer)